I would like to have two different styles of theorems in my LaTeX document to differentiate between original and unoriginal work. For one I would like the 'Theorem' underlined and the other I would like without extra text decoration (as normal).
I use the amsthm package for theorems usually.
For example I would like two different theorems that look like the following would.
\textbf{Theorem 2.2.} \textit{blah blah blah}
\underline{\textbf{Theorem 2.3.}} \textit{blah blah blah}